| 摘要 |
<p>The invention relates to a network feed device (10) for feeding electrical energy from a DC energy source (12) into a three-phase AC supply network (32), where the DC voltage of a DC intermediate circuit (24) is converted by means of at least one inverter unit (14) into a three-phase voltage and is fed by means of a transformer device (16) comprising three network transformer windings (38) into the AC supply network (24). The invention is characterized in that a first winding terminal of the network transformer windings (38) is connected to a half-bridge (30) of a first inverter device (14a), and a second winding terminal of the network transformer windings (38) of the transformer device (16) is connected to a half-bridge of a second inverter device (14b). In subsidiary aspects, the invention relates to an energy feed system for the connection of a photovoltaic source, a fuel cell source, a battery source or a mechanically operated DC generator to an AC supply network or to an AC consumer, in particular a three-phase motor, and an operating method for energy-efficient voltage feeding.</p> |
